Error 0xc1900101 on Windows 11 Installation Assistant

Here is a full guide on how you can fix the error code 0xc1900101 on Windows 11 Installation Assistant. Microsoft has launched Windows 11 Installation Assistant that enables users to easily upgrade to the new OS i.e., Windows 11. While it is an easy way to install Windows 11 on your system, some users have also experienced errors while using it. One such error is the error code 0xc1900101 which prevents you from installing Windows 11 on your PC. If you are one of those encountering the same error code while using Windows 11 Installation Assistant, this article is your stop. In this guide, we are going to show you some methods that will help you fix the error. Let us check out.

What causes error 0xc1900101 on Windows 11 Installation Assistant?

An error that begins with 0xC1900101 is usually a driver error. Similar error codes you may see are:

• 0xC1900101 – 0x2000c
• 0xC1900101 – 0x20017
• 0xC1900101 – 0x30018
• 0xC1900101 – 0x3000D
• 0xC1900101 – 0x4000D
• 0xC1900101 – 0x40017

The other reasons for this error code to appear could be:

• If you have a third-party antivirus installed on your PC, it might hinder the Windows 11 upgrade process. If the scenario applies, disable or uninstall your third-party antivirus suite.
• If you are running low on disk space and don’t have enough space to upgrade Windows, it may result in error code 0xc1900101.
• Outdated drivers can be another cause for this error.
• This error code can be triggered due to Outdated BIOS. As we all know, the new Windows 11 OS has some installation prerequisites to fulfill. So, you will have to update BIOS to the latest for resolving the issue.
• Some other reasons for this error can be software conflicts or extra hardware that is plugged into your PC.

In any scenario, you should be able to fix the error by following the below methods.

Fix Error Code 0xc1900101 on Windows 11 Installation Assistant

Here are the methods to fix the error code 0xc1900101 while using Windows 11 Installation Assistant:

1. Update your third-party drivers.
2. Disable Third-Party Antivirus.
3. Ensure that there is sufficient storage space on your PC.
4. Unplug additional hardware.
5. Fix hard-drive errors using the CHKDSK command.
6. Restore and repair system files through DISM scan.
7. Troubleshoot in a Clean Boot State.
8. Update BIOS.
9. Clean Install Windows 11.
10. Upgrade to Windows 11 using Windows 11 Disk Image (ISO) file from Microsoft.

1] Update your third-party drivers

Out-of-date and faulty third-party drivers can cause this error during the upgrade process. So, before installing Windows 11 via the installation assistant, make sure all your drivers are updated. You can manually check for driver updates available by going to Settings > Windows Update > Advanced options > Optional updates. If there are updates available for your drivers, download and install them.

You can also go to the official website of your device manufacturer and find the latest drivers. Apart from that, there are some free third-party driver updaters that help you automatically install the latest drivers on your system.

After updating your drivers, relaunch Windows 11 Installation Assistant and check if the error is fixed.

Related: The installation failed in the SAFE_OS phase during INSTALL_UPDATES, 0x800F081F – 0x20003

2] Disable Third-Party Antivirus

If you have a third-party antivirus installed on your PC, the first thing you should do to fix this error is to disable it. Overprotective antiviruses are known to cause problems during the upgrade and update process. So, disable whichever antivirus you are using and then check if the issue is resolved.

If disabling doesn’t help, you might need to uninstall the third-party security suite completely from your PC. You uninstall the antivirus program via the Settings app. Another option is to uninstall it using a free third-party uninstaller program.

Now, continue to install Windows 11 using Windows 11 Installation Assistant and see if the error is resolved now. If that doesn’t fix the problem, you can move on to the next potential solution to fix it up.

3] Ensure that there is sufficient storage space on your PC

Insufficient disk space can cause this upgrade error while using Windows 11 Installation Assistant. As it will download Windows 11 on your system drive and on the same partition, you need to have enough storage space to install the new OS. And, if you are running low on disk space, it can result in error code 0xc1900101. Hence, make sure that you have sufficient disk space for installing Windows 11 via Windows 11 Installation Assistant. A free disk space of 100 GB is recommended to prevent this error.

To free up some disk space, you can use the Windows built-in Disk Cleanup Utility. You can also clean up or free up disk space using some other freeware. Apart from that, you can try deleting duplicate files from your system to get some free space.

Read: Fix Windows Upgrade Assistant Error 0xC1900200

4] Unplug additional hardware

Before upgrading, it is recommended to unplug all the connected flash drives, docks, and other hardware that are not necessary at the moment. After unplugging devices, check if the error is fixed.

5] Fix hard-drive errors using the CHKDSK command

Hard drive errors can also cause error code 0xc1900101 while using Windows 11 Installation Assistant. So, try repairing the drive error and then check if the issue is resolved. You can run Windows built-in disk repair tool called CHKDSK. Open Command Prompt as an administrator and then enter chkdsk/f C: command to check and fix errors on System Drive (C). After the command is executed, restart your device and then continue the upgrade process using Windows 11 Installation Assistant.

6] Restore and repair system files through DISM scan

If there is corruption in your system that is causing this error, you should be able to fix it by running a DISM or Deployment Image Servicing and Management scan. To perform a DISM scan, open Command Prompt as an administrator and then enter the below command:

Dism /Online /Cleanup-Image /RestoreHealth

When the scan is completed, restart Windows 11 Installation Assistant and then check if the error is resolved now.

7] Troubleshoot in a Clean Boot State

If the error is still not fixed even after trying the above methods, you can try performing a clean boot in Windows to resolve the error. The error might be caused due to some software conflicts and a clean restart will eliminate that possibility. So, start Windows in a clean boot state and then check if the error is resolved.

8] Update BIOS

In case the above solutions didn’t work, you can try updating BIOS to resolve the error. This error might be a result of outdated BIOS firmware and we know the minimum installation requirements for Windows 11. If your BIOS firmware is out-of-date, it can cause errors during the upgrade process. So, if indeed that is the main culprit, you should be able to resolve it by updating BIOS. This guide to update BIOS will help you do that. See if this fixes the error for you. If not, move to the next potential fixes.

Related: Error 0x800f0830-0x20003, Installation failed in SAFE_OS phase with error during INSTALL_UPDATES operation

9] Clean Install Windows 11

If you still receive the same error on Windows 11 Installation Assistant, the last resort to fix the error is to clean install Windows 11. Microsoft has made it easier to install Windows 11 with multiple methods. If Windows 11 Installation Assistant doesn’t work for you, you can opt for another method to upgrade to Windows 11 and perform a clean install from USB.

10] Upgrade to Windows 11 using Windows 11 Disk Image (ISO) file from Microsoft

You can also try upgrading from Windows 10 to Windows 11 using Windows 11 Disk Image (ISO) file from Microsoft. Simply download the ISO file and then use it for upgrading to Windows 11.

Read: Fix Windows Update error 0x800f0247 on Windows 11/10

How do I fix error 0xC1900101?

To fix the error code 0xC1900101 while installing updates on Windows, you should make sure that you have sufficient space on your PC to install updates. Other than that, you can run Windows Update Troubleshooter, Unplug extra or additional hardware, update third-party drivers, check Device Manager for errors, disable third-party security software, repair hard-drive errors, or restore and repair Windows Update files. You can check out this guide to fix Windows update error 0xC1900101.

How do I fix error code 0x80070002?

The error code 0x80070002 is a Windows update error code. It can be caused due to corruption in Registry files, blockage from a third-party antivirus, or if the date and time are out of sync. You can fix this error by running the Windows update troubleshooter, running an SFC scan command, or resetting Windows Update components. To check out more fixes, follow this guide to fix Windows Update error code 0x80070002.

That’s it!

Now read: Error 0x8007007f when using Windows 11 Installation Assistant.